Cresporhaphis

Leptosillia is a fungal genus in the monogeneric family Leptosilliaceae. The genus was established in 1928 by the Austrian mycologist Franz Xaver Rudolf von Höhnel and was originally thought to contain only one species for many decades. The bark-dwelling fungi of Leptosillia primarily live as harmless residents inside tree tissues, occasionally forming partnerships with microscopic algae, though one species can cause disease in pistachio trees. They produce tiny black, flask-shaped fruiting bodies on tree bark and are found mainly in temperate regions of Europe, though related species probably occur worldwide....read more on Wikipedia.